Fix busy loops. (#3392)

polkadot/node/network/availability-recovery/src/lib.rs

@@ -806,8 +806,8 @@ impl AvailabilityRecoverySubsystem {
 						}
 					}
 				}
-				output = state.interactions.next() => {
-					if let Some((candidate_hash, result)) = output.flatten() {
+				output = state.interactions.select_next_some() => {
+					if let Some((candidate_hash, result)) = output {
 						state.availability_lru.put(candidate_hash, result);
 					}
 				}